为什么printf首先比cout更有效 [英] why printf works first than cout
问题描述
这是一个代码。输出将是
为什么会这样。任何人都可以解释我这个..
4444 2222 7777 8888
aaaa
********* **********************
#include< stdio.h>
#include< iostream .h>
int main(无效)
{
char * test =" 4444 2222 7777 8888" ;;
cout<<"" aaaa";
printf(" New string:%s \ n",test);
返回0;
}
*********************** **********
谢谢
Pai ......
pai写道:
这是一个代码。输出将是
为什么会这样。任何人都可以解释我这个..
4444 2222 7777 8888
aaaa
***** ************************** *
#include< stdio.h>
#include< iostream.h>
int main(无效)
{
char * test =" ; 4444 2222 7777 8888" ;;
cout<<" aaaa";
printf(" New string:%s \ n",测试);
返回0;
}
*************** ******************
谢谢
Pai ...
Cout是缓冲的,你没有将它与stdio同步(参见,例如,
http://www.cplusplus.com/ref/iostrea...th_stdio.html) 。
干杯! --M
pai写道:
>
这是一个代码。输出将是
为什么会这样。任何人都可以解释我这个..
您的标准库实现已经破坏。
cout和stdout应该是同步的一起
默认情况下。
当然,如果你使用的话,你没有使用标准库
cout ; iostream.h> ;.
尝试使用< iostreamand看看它是否更好。
mlimber写道:
Cout是缓冲的,你没有将它与stdio同步(参见,例如,
http://www.cplusplus.com/ref/iostrea...th_stdio.html) 。
sync_with_stdio在defualt中为真。
Hi,
This is a code . the output will be
why is this so. Can any nody explain me this..
4444 2222 7777 8888
aaaa
*******************************
#include <stdio.h>
#include<iostream.h>
int main(void)
{
char* test = "4444 2222 7777 8888";
cout<<"aaaa";
printf("New string: %s\n", test);
return 0;
}
*********************************
thanks
Pai...
pai wrote:Hi,
This is a code . the output will be
why is this so. Can any nody explain me this..
4444 2222 7777 8888
aaaa
*******************************
#include <stdio.h>
#include<iostream.h>
int main(void)
{
char* test = "4444 2222 7777 8888";
cout<<"aaaa";
printf("New string: %s\n", test);
return 0;
}
*********************************
thanks
Pai...Cout is buffered, and you didn''t sync it with stdio (see, e.g.,
http://www.cplusplus.com/ref/iostrea...th_stdio.html).
Cheers! --M
pai wrote:Hi,
This is a code . the output will be
why is this so. Can any nody explain me this..
Your standard library implementation is broken.
cout and stdout are supposed to be sync''d together
by default.
Of course, you''re not using a standard library
cout if you are using <iostream.h>.
Try it with <iostreamand see if it works better.
mlimber wrote:
Cout is buffered, and you didn''t sync it with stdio (see, e.g.,
http://www.cplusplus.com/ref/iostrea...th_stdio.html).
sync_with_stdio is true by defualt.
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